Improved concrete compound for pavements



UNITED STATES PATENT OFFICE.

JOHN W. SMITH, OF WASHINGTON, D. 0., ASSIGNOR T0 JOHN G. PEDRIOK AND BENJAMIN FENNER OF FIVE-EIGHTHS INTEREST.

IMPROVED CONCRETE COMPOUND FOR PAVEMENTS, &c.

Specification forming part of Letters Patent No. 96,984, dated November 16, 1869.

To all whom it may concern:

Be it known that I, JoHN W. SMITH, of the city of Washington, in the District of Columbia, have invented a new Concrete Composition, which is adapted for the pavingof streets, for the manufacture of artificial stone, for flagging, for carriage-steps. for the making of rollers as a substitute for iron in roll ng concrete for pavements, and for other useful purposes for which the same may be found adapted.

The nature of my invention consists in mixing coal-tar, pitch, or asphaltum and sulphuric acid with clay, sand, gravel, broken stone, gypsum, cement, salt, alum, and sal-ammoniac, all in a dry state.

To prepare my new concrete, I proceed as follows: I take about forty gallons of coaltar or pitch, or asphaltum, both or either, or all, and heat until melted. I then, While in ahot state, pour into the mixture about one pint of sulphuric acid, pouring itin graduallyfand continually stirring the mass.

1 also mix the following articles, in about the following proportions, all in a dry state: Six parts of dry clay, raw or burned; six

parts dry sand; six parts dry gravel or bro-'- roller, spffiililing"at the same time with dry ea rth or dust.

I also prepare the foregoing concrete by mixing the ingredients in their cold state, and

lay it down in the street wlthogfithaanplisw,

catioi1,o,heat. I also form my concrete into blocks or bricks, with or without the use of molds, and lay these down in a hot or cold state, as desired. I alsoform my concrete of the consistency of a mortar, to be applied as a mortar with a trowel when desired.

I do not confine myselt' t0 the exact proportions herein named, as the requirements of different climates-and purposes necessarily involve some variations in the proportions of the ingredients of my compound, and in some cases I le ayeputthe.alulufillllfilkfi one or both.

I claim as my invention The manufacture or preparation of the compound, substantially as herein described, and for the purposes to which the same is found adapted.

JOHN W. SMITH.

Witnesses:

J. G. PEDRIOK, E. MGUARTEN. 

